head to head
DeltarunevsUndertale
Deltarune leans Execution (Practiced Mastery); Undertale leans Optimization (Pure Optimization).
DeltaruneUndertale
Axis by axis
Execution5 vs 4
Deltarune leans harder on execution: Bullet-hell dodging in battles demands real reflexes
Reads0 vs 1
Undertale leans harder on reads: NPCs follow fixed dialogue trees, not adaptive
Variance1 vs 1
Even - both lean on variance about the same.
Optimization5 vs 7
Undertale leans harder on optimization: Learning fixed boss patterns and mercy routes wins
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.

